/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.executor.operator;

import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;

/**
 * Basic interface for producer which can finish driver by itself.
 */
public interface ProducerExecutor {

    ListenableFuture<?> NOT_BLOCKED = Futures.immediateFuture(null);

    /**
     * this operator is finished or not
     */
    boolean produceIsFinished();

    /**
     * this operator is blocked or not if this operator isn't finished.
     */
    ListenableFuture<?> produceIsBlocked();

    default void forceClose() {

    }
}
